Function build_response 

pub fn build_response(
    protocol_results: Vec<ActionResult>,
    protocol_label: &str,
    method: &str,
    uri: &str,
    status_tx: &UnboundedSender<String>,
    default_response: Option<(u16, Vec<(String, String)>, String)>,
) -> Result<Response<Full<Bytes>>, Infallible>

Build HTTP response from LLM execution results